TECHNICAL DATA This compilation of technical data is intended to supply essential information relating to cable tray systems and to aid in the selection of the correct Vantrunk cable tray system. This will ensure that the specified cable tray installation is adequately protected against corrosion and has suitable strength & rigidity to provide reliable support at minimum installed cost. Our Design Team is available to answer any questions relating to particular site requirements which may not be answered in the following sections.
Contents 1.0 Vantrunk Cable Tray – General Information
PAGE
1.1 Slot Patterns 1.2 Profiles 1.3 Side Wall Heights 1.4 Cable Tray Fitting Radius 1.5 Material Gauges 1.6 Recommended Number of Fixings of Cable Tray Fittings 1.7 Perforation Base Area 1.8 Cross Sectional Area 1.9 Vantrunk Cable Tray Specification
149 149 149 149 150
2.0 Installation
PAGE
2.1 Loads 2.2 Support Spacing 2.3 Locations of Couplers 2.4 Support Locations of Cable Tray Fittings 2.4.1 Flat Elbows 2.4.2 Inside & Outside Risers
154 154 154 155 155 156
ACCREDITED TO THE FOLLOWING STANDARD
148
151 152 152 152
2.5 2.6 2.7 2.8 2.9
2.4.3 Equal & Unequal Tees 2.4.4 Crosses 2.4.5 Reducers Loading of Vantrunk Cable Tray & Supports Electrical Continuity Characteristics Electromagnetic Compatibility (EMC) Assembly Recommendations 2.8.1 Straight Cable Tray to Straight Cable Tray 2.8.2 Cable Tray Fitting to Straight Cable Tray 2.8.3 Cable Tray Fitting to Cable Tray Fitting Cable Tray Expansion Joint
156 156 156 157 158 158 158 158 159 159 160
3.0 Loading Information
PAGE
3.1 Dead Loads 3.2 Point Loads 3.3 Load Graphs
161 161 162
Side Wall Heights for Vantrunk Cable Tray Tray & Fitting Type
50
25
25
Medium Duty Return Flange 25
Side Wall Height mm
50 to 900
25 30
25
Accessories
50 50
Width mm
35
25
40 45 50
8
Cable Ladder
55
20
8
Steel Framing
Details of the slot patterns for the Vantrunk cable tray system are given in the following diagram. These slot patterns are common for each Vantrunk cable tray type, irrespective of material gauge and finish.
The Vantrunk cable tray range is available with the following side wall heights.
Cable Tray
Lengths
1.1 Slot Patterns
1.3 Side Wall Heights
Couplers
1. GENERAL INFORMATION
Fittings
tECHNICAL DATA
60
12
70
Covers
75 80 Heavy Duty Return Flange
85
50 to 900
Supports
65
90 95 100
1.2 Profiles
Technical
110 115 120 125
Heavy Duty Return Flange
130 135 140
Mounting Frame
105
145
8 25
150
Material Gauge (See 1.5)
4
Fixings
Tray Width W
1.4 Cable Tray Fitting Radius
External Width W 1
Vantrunk cable tray fittings are available with the following standard radii.
Medium Duty Return Flange
Standard Radius For Cable Tray Fittings
4
T
Material Gauge (See 1.5)
External Width W 1
Inside & Outside Risers (mm) MR
HR
50 75
Tray Width W
Flat Elbows, Tees & Crosses (mm)
100
75
150
150 200 225
300
300 450
150
Technical
50
Tray Width (mm)
Bespoke
8
300
600 750 900
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Index
(Also available in 30mm to 150mm, see 1.3 for details)
CABLE TRAY SYSTEM
All Vantrunk cable tray fittings are available to order with radii of 300mm, 450mm & 600mm. Those cable tray fittings which have a standard radius of 75mm are also available to order with a radius of 150mm. Consult our Sales Team for details.
1.5 Material Gauges The standard range of material gauges for the Vantrunk cable tray & fittings have been determined by providing the most cost effective and efficient gauge for each material type to suit the designed application of each of Vantrunk cable tray system types. The following table shows the standard material gauges for each width and type of Vantrunk cable tray system in a number of finishes. Consult our Design Team for gauge details for other materials & finishes.
The standard material gauges are supplied for each tray and fitting type & width unless otherwise specified. To order a non-standard gauge, suffix the part number with the required gauge in millimeters. Consult our Design Team for guidance on the appropriate selection of non-standard material gauge combinations. Weights, where quoted in the catalogue, are for the standard gauge mild steel/hot dip galvanized item. The following correction factor should be used to determine the weight for the corresponding item in an alternative gauge and finish. As an example: A heavy duty return flange cable 90° flat bend, 600mm wide, hot dip galvanized finish in standard 2.0mm gauge weights 9.56kg. Equivalent weight of the stainless steel item in 2.0mm gauge = 9.56kg x 0.96 = 9.18kg. Material & Gauge Correction Factor
Hot Dip Galvanized Mild Steel (GA)
Stainless Steel (SS)
Hot Dip Galvanized Silicon Rich, Steel (GX)
1.58
1.60
1.76
2.0
2.10
2.13
2.35
0.9
0.83
0.84
1.08
Required 1.0 Gauge 1.2
0.92
0.94
1.20
1.12
1.14
1.42
300
1.5
1.42
1.44
1.76
450
2.0
1.89
1.92
2.35
0.9
0.69
0.70
0.81
1.0
0.77
0.78
0.90
1.2
0.93
0.95
1.07
50
1.5
1.18
1.20
1.32
75
2.0
1.57
1.60
1.76
0.9
0.55
0.56
0.65
1.0
0.61
0.62
0.72
1.2
0.75
0.76
0.85
1.5
0.95
0.96
1.05
2.0
1.26
1.28
1.41
0.9
0.41
0.42
0.49
1.0
0.46
0.47
0.54
1.2
0.56
0.57
0.64
1.5
0.71
0.72
0.79
2.0
0.94
0.96
1.06
75
75
100 150
0.9
150 Covers
225 300
1.5 1.2
450 600 750
1.2
100
0.9
0.9
225
750
1.5
0.9
0.9
200
600
1.5
900
Standard Gauge
100 0.9
200 MR
Hot Dip Galvanized Silicon Rich Steel (GX)
1.42
1.5
50
Stainless Steel (SS)
1.26
50
Hot Dip Galvanized Mild Steel (GA)
1.24
Width
1.20
1.2
Tray Type
1.08
1.04
Hot Dip Galvanized Silicon Rich Steel (GX)
0.94
1.02
Stainless Steel (SS)
0.92
1.0
Hot Dip Galvanized Mild Steel (GA)
0.9
Width
Tray Type
Material Gauges
900
1.5
1.2
1.2
1.5
1.5
Standard Gauge 1.0
1.2
0.9
150 200 HR
225
1.5 1.2
1.0
1.5
300 450 600 750 900
1.5 2.0
1.2 1.5
2.0
Required Gauge
Consult our Technical Team for other material & gauge combinations.
150
Tray Type Heavy Duty Return Flange
50 to 150 225
Description
Hot Dip Galvanized Cable Tray
Fixings
Fixings
included with
included with
couplers
couplers
50 to 150
4
4
200
6
6
225
6
6
Fish Plate
300
6
6
Couplers
450
8
8
600
10
10
750
12
12
900
16
16
Straight
300
Lengths
450 600
M6 x 12
750
Mushroom Head Bolt
Screw M6 Flat Washer M6 Hex Nut
The following table gives the recommended number of fixings for each type of cable tray straight length, fish plate coupler & cable tray fitting.
50
4
4
200
5
5
Variable
225
5
5
Risers
300
5
5
Inside/
450
6
6
Outside
600
7
7
750
8
8
900
10
10
Flat Elbows
Risers
Equal Tees Unequal* Tees
Crosses
Reducers*
50 to 150
8
8
225
10
10
225
10
10
300
10
10
450
12
12
600
14
14
750
16
16
900
20
20
50 to 150
12
12
200
15
15
225
15
15
300
15
15
450
18
18
600
21
21
750
24
24
900
30
30
75 to 150
4
4
200
5
5
225
5
5
300
5
5
450
6
6
600
7
7
750
8
8
900
10
10
*Use largest width to determine the required number of fixings
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Cable Ladder Fixings
SSM6x12PNW
Bespoke
M6 x 12 Pan Head
Technical
Stainless Steel
Covers
900
M6 Square Nut
Technical
M6x12RNB
Accessories
200 Part Number
Steel Framing
Medium Duty Return Flange
Supports
Cable Tray Fixing Sets
Width mm
Mounting Frame
Item
151 Index
Vantrunk cable tray fittings have integral jointing strips for connecting to straight lengths and for connecting cable tray fittings to cable tray fittings. The cable tray fixing set comprises of an M6 x 12 screw and an M6 nut (plus an M6 flat washer for stainless steel fixings).
Recommended Number of Fixings for Cable Tray Couplers
1.6 Recommended number of fixings of cable tray fittings
Cable Tray
Lengths Fittings
tECHNICAL DATA
CABLE TRAY SYSTEM
1.7 Perforation Base Area Vantrunk straight cable tray has the following perforation base area:
The cross sectional areas given in the table above exclude return flanges where appropriate – see the following illustration for the cross section which is included as part of the area calculation.
Perforation Base Area for Vantrunk Cable Tray Tray Type
Perforation Base Area
Classification to BS EN 61537
Medium Duty Return Flange
9.14%
B
Heavy Duty Return Flange
9.14%
B
Consult our Design Team for perforation base area classifications for Vantrunk cable tray fittings. Consult our Design Team for cross-sectional area information for Vantrunk cable tray fittings.
1.8 Cross-sectional Area The Vantrunk cable tray has the following cross-sectional areas (CSA): Cross-sectional Area for Vantrunk Cable Tray Tray Type
Width
CSA mm2
50
1040
75
1628
100
2215
150
3390
Medium Duty
200
4565
Return Flange
225
5153
300
6915
450
10440
600
13965
750
17490
900
21015
50
2290
75
3503
100
4715
150
7140
Heavy Duty
200
9565
Return Flange
225
10778
300
14415
450
21690
600
28965
750
36240
900
43515
CSA information is based on standard gauges in a hot dip galvanized finish. Consult our Design Team for other gauges and materials.
1.9 Vantrunk Cable Tray Specification The following is a typical specification for a cable tray system which incorporates the key features of the Vantrunk cable tray system. 1
The cable tray system shall comprise a perforated base with longitudinal upward facing side walls. Medium duty and heavy duty cable tray shall have returned flanges on the side walls for improved strength.
2 The profile of the cable tray straight lengths shall remain constant for the straight cable tray and shall be compatible with that of the matching cable tray fittings. 3 The inside of the cable tray shall present a smooth surface to allow for easier cable pulling and to minimise the opportunities for damage to the cable insulation. 4 The cable tray side walls shall have an overall height of:
For medium duty return flange cable tray: 25mm for all tray widths.
For heavy duty return flange cable tray: 50mm (or required side wall height) for all tray widths.
5 The cable tray shall have a width of 50mm, 75mm 100mm, 150mm, 225mm, 300mm, 450mm, 600mm, 750mm and 900mm as required. The width shall be measured internally between the side walls.
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Couplers for the cable tray system shall be either of flat bar type or profiled to match the profile of the cable tray. Couplers shall be secured using M6 x 12 fixings with smooth heads to minimise possible damage to cables.
Technical
Covers
For silicon rich, deep galvanized tray – all types: 1.5mm for tray of width 50mm to 450mm 2.0mm for tray of widths 600mm to 900mm. 7 Straight cable tray shall be fully slotted with longitudinal slots of size 20mm x 8mm and transverse slots of size 12mm x 8mm. The slots shall be pitched at 25mm centres across the width of the cable tray and at 50mm centres along the length of the cable tray. 8 Straight cable tray shall have a length of 3000mm. 9 Cable tray fittings shall be suitable slotted to match the slot pattern in the straight cable tray and shall have integral joints to facilitate connection to straight tray lengths and to other cable tray fittings.
Cable Ladder Steel Framing
14
Supports
For heavy duty return flange cable tray: 0.9mm for tray of widths 50mm to 150mm, 1.2mm for tray of widths 225mm and 300mm 1.5mm for tray of width 450mm 2.0mm for tray of widths 600mm to 900mm (1.5mm for width of 600mm in pre-galvanized and stainless steel).
For silicon rich, deep galvanized finish: silicon-rich steel and shall be deep galvanized after manufacture to twice the coating thickness specified by BS EN ISO 1461.
Mounting Frame
Cable Tray
Lengths
For medium duty return flange cable tray: 0.9mm for tray of widths 50mm to 225mm, 1.2mm for tray of width 300mm (1.0mm for pre- galvanized and stainless steel) 1.5mm for tray of widths 450mm to 900mm.
For stainless steel : stainless steel grade 1.4404 (316 marine grade) to BS EN 10088.
Couplers
Accessories
6 The cable tray shall have a minimum thickness as follows for hot dip galvanised finish, other finishes consult our sales team:
Fittings
tECHNICAL DATA
Cable tray fittings (except risers) shall have a radius of 75mm for widths up to & including 150mm, & a radius of 150mm for widths of 225mm and above. Cable tray risers shall have a radius of 150mm for widths up to & including 150mm, & a radius of 300mm for widths of 225mm & above.
12
Cable tray risers shall be of a variable angle type to facilitate on-site adjustment from 0° to a minimum of 90° for widths up to & including 600mm, and shall be pre-formed to fixed angles of 90°, 60°, 45° and 30° for widths of 750mm and above.
Bespoke
11
Fixings
10 Cable tray flat bends shall have fixed angles of 90°, 60°, 45° and 30°.
13 The cable tray system shall be manufactured using: Technical
For mild steel, hot dip galvanized finish: mild steel grade DD11 to BS EN 10111 and shall be hot dip galvanized after manufacture to BS EN ISO 1461.
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Index
CABLE TRAY SYSTEM
2. INSTALLATION RECOMMENDATIONS 2.1 Loads A correctly designed and specified cable tray installation should take into account the nature and extent of the loads which will be imposed on the cable tray system. These loads comprise of dead loads including the selfweight of the cable tray system, the weight of the cables and secondary equipment attached to the cable tray, imposed loads which occur during installation of the cable tray system and during cable pulling operations, and external loads such as wind, snow & ice.
remembered that it is necessary to support accessories when a change of direction takes place i.e. bends, tees, risers etc. This is to ensure that undue ‘corner’ cantilever reaction is minimised.
Cable trays are often employed in locations where the wind speeds may cause considerable lateral loading and careful consideration must be given to design to ensure a satisfactory installation. An awareness of the worst possible climate conditions is necessary when specifying the correct Vantrunk cable tray system.
2.3 Location of Couplers
The load-deflection information given in 3.4 is based on static loading of the Vantrunk cable tray installation. This information does not take into account dynamic effects such as vibration, earthquake loading, etc. In designing a cable tray installation it is good practice to allow at least a 20% excess capacity in a new installation for future expansion. Such a provision is of great economic advantage when there is a later need for additional cables.
2.2 Support Spacing The space between the supports of a cable tray installation is referred to as the span. Supports for cable tray should, as far is practicable, be spaced so as to create the most economical load/span ratio to suit the capacity of the cable tray system. This will give the most advantageous solution when considering procurement and installation costs. As a general rule of thumb, the load-carrying capability of the Vantrunk cable tray system increases as the span decreases, so a lighter duty cable tray system can be specified for shorter spans. Conversely, a heavier duty Vantrunk cable tray system will need to be specified as the span increases. Vantrunk cable tray can provide cost-effective support for cable loads at spans of 0.5m to 3m depending on the type of cable tray system selected. For longer spans, or for carrying significantly increased cable loads, the Speedway cable ladder system should be used. When considering support positions it should be
154
Recommendations for the location of supports for Vantrunk cable tray fittings are given in section 2.4.
The maximum bending moments acting on a cable tray run occur in the cable tray at the supports and at the mid span position. For this reason it is good practice to avoid locating couplers in a cable tray run either directly on supports or at the mid span position. It is also good practice to avoid locating couplers in the end span of a continuous beam installation as the bending moments in the end span are, for simple end support installations, much higher than those found in the intermediate spans. These limitations cannot always be achieved in a cable tray installation and are not a mandatory requirement for the Vantrunk cable tray coupling system where the loading information given in 3.3 is valid irrespective of the location of the couplers. The ideal positions to locate the connections in a cable tray run are at approximately one fifth to one quarter of a span from the supports where the bending moments, and hence the stresses, are minimal. Positioning the couplers at the one fifth to one quarter span positions is of benefit during installation, assisting in alignment of the cable trays and allowing unhindered securing of the cable tray to the supports.
Ideal Coupler Location
Coupler located at 1/4 to 1/5 of the span Allowable Coupler Location
Coupler located at mid span position Inappropriate Coupler Location
Coupler located at the support position
2.4 Support Locations for Cable Tray Fittings It is also important to consider support locations for cable tray fittings which are used as part of a cable tray installation to change direction, change width or create intersections.
30° Flat Elbow For 30° flat elbows, supports should be placed within 150mm of the fitting for widths up to 300mm. For fittings of width 450mm and above, supports should be placed within 300mm of the fitting and an intermediate support should be located radially at 15° across the centre of the fitting.
60° Flat Elbow For 60° flat elbows, supports should be placed within 150mm of the fitting for widths up to 300mm. For fittings of width 450mm and above, supports should be placed within 300mm of the fitting and an intermediate support should be located radially at 30° across the centre of the fitting.
Cable Ladder Steel Framing
≤300mm
≤150mm ≤150mm
Supports
2.4.1 Flat Elbows
Covers
The following illustrations show the recommended support positions when installing Vantrunk cable tray fittings. The supports should be fully fixed to provide maximum support for the Vantrunk cable tray fitting.
Accessories
Couplers
Vantrunk cable tray fittings are designed to carry loads comparable to that for the straight cable tray but will require local support to avoid undue stresses being applied to the fittings.
Cable Tray
Lengths Fittings
tECHNICAL DATA
≤300mm
≤300mm
≤450mm
≤300mm
45° Flat Elbow For 45° flat elbows, supports should be placed within 150mm of the fitting for widths up to 300mm. For fittings of width 450mm and above, supports should be placed within 300mm of the fitting and an intermediate support should be located radially at 22.5° across the centre of the fitting.
90° Flat Elbow For 90° flat elbows, supports should be placed within 150mm of the fitting for widths up to 300mm. For fittings of width 450mm and above, supports should be placed within 300mm of the fitting and an intermediate support should be located radially at 45° across the centre of the fitting.
≤300mm
≤150mm
Bespoke
≤300mm
Intermediate Support
≤150mm
≤150mm
≤300mm
≤300mm
Intermediate Support
≤300mm
≤450mm
≤300mm
Technical
≤150mm
≤450mm
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Index
≤300mm
Intermediate Support
≤150mm
Mounting Frame
≤300mm
Fixings
Intermediate Support
≤150mm
Technical
≤300mm
CABLE TRAY SYSTEM
2.4.2 Internal & External Risers Internal Risers For all widths of internal risers, supports should be placed within 300mm of the fitting.
For internal & external risers used in an offset arrangement of length over 600mm, supports should be located within 300mm of each end of the internal & external risers. The inclined cable tray should be supported in accordance with the support recommendations for the straight cable tray run.
300mm
0m
30
30
0m
m
m 30 0m
Offset Length 600mm
m
300mm
External Risers For all widths of external risers, supports should be placed within 300mm of the fitting.
300mm
300mm
30
0m
m
2.4.3 Equal & Unequal Tees For equal and unequal tees, supports should be placed within 150mm of the fitting for main or branch widths up to 300mm. For fittings of main or branch width 450mm and above, supports should be placed within 300mm of the fitting. 150mm
Internal & External Risers Used In Offset Arrangement For internal & external risers used in an offset arrangement of length up to 600mm, supports should be located within 300mm of each end of the offset and centrally on the inclined cable tray.
150mm
300mm
150mm
300mm
300mm
300mm
300mm
Intermediate Support 450mm Offset Length 600mm 300mm 300mm
156
450mm
150mm
Wherever possible, cable tray should be loaded in a uniform manner across the full width of the cable tray, particularly when the cable tray is loaded to the recommended load carrying capacity.
Covers
150mm
300mm
Cable Ladder Steel Framing
The safe working load figures for the Vantrunk cable tray and support accessories are based on a uniform loading within the Vantrunk cable tray and on the assumption that the correct length of support is used in each case.
300mm
Accessories
150mm
Supports
It is important that cable tray and cable tray supports are loaded in a symmetrical manner such that undue stresses in both the cable tray and the supports are kept to a minimum.
150mm
Cable Tray
Lengths
For crosses, supports should be placed within 150mm of the fitting for main or branch widths up to 300mm. For fittings of main or branch width 450mm and above, supports should be placed within 300mm of the fitting.
2.5 Loading of Vantrunk Cable Tray & Supports
Couplers
2.4.4 Crosses
Fittings
tECHNICAL DATA
300mm
300mm
Avoid non-uniform loading 300mm
Load uniformly across the width of the cable tray
Where cantilever supports of additional length are used to support cable tray, care should be taken to position the cable tray as close to the backplate of the cantilever as the installation routing will allow.
450mm
2.4.5 Reducers
Mounting Frame
450mm
Fixings
Technical
300mm
Bespoke
For all widths of reducers (straight, left & right), supports should be placed within 300mm of the fitting.
300mm
Safe working load information for cable tray supports is given in the ‘Supports’ section of this catalogue. For further information and guidance on the design and loading of supports please contact our Design Team.
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Index
300mm
Load cantilevers close to the backplate
Technical
Avoid unsymmetrical loading on cantilevers
CABLE TRAY SYSTEM
2.6 Electrical Continuity In tests conducted to verify the electrical continuity characteristics of the Vantrunk cable tray it has been established that the standard coupling system provides adequate electrical continuity, ensuring equipotential bonding and connection to earth. The Vantrunk cable tray system has been tested for electrical continuity to BS EN 61537 (Section 11.1).
Impedance across joint
Impedance per metre length
2mΩ
2mΩ
Hot Dip Galvanized (0.9mm) Hot Dip Galvanized (1.5mm)
2mΩ
2mΩ
Stainless Steel (1.2mm)
2mΩ
2mΩ
BS EN 61357 requires a maximum impedance of 50mΩ across the coupled joint and a 5mΩ per metre length without a joint. Earth continuity bonding straps (part number EBS/05) of cross sectional area 4 mm2 are available for use with Vantrunk cable tray where a non-conductive surface finish i.e. epoxy coated etc, has been specified or where the installation requires an additional means of bonding. Consult our Technical Team for more details.
2.7 Electromagnetic Compatibility (EMC)
1. Position the two straight cable trays onto the supporting structure. 2.
For flat bar couplers, locate the cable tray flat bar coupler on the inside of the two abutting straight cable trays. For wrap over couplers, position the coupler on the outside of the two abutting straight cable trays.
3.
Position the coupler across the joint between the two straight lengths. For flat bar couplers, align the slots in the coupler with those in the side wall of the cable tray. For wrap over couplers, align the slots in the coupler with those in the base of the cable tray.
4. From the inside of the cable tray insert the threaded portion of an M6 x 12 screw through one of the aligned slots. 5. Fit an M6 flat washer (where provided) and an M6 hex nut onto the protruding thread of the M6 x 12 screw.
In normal use Vantrunk cable tray can be considered to be passive in respect of electromagnetic influences, emission and immunity. When Vantrunk cable tray is installed as part of a wiring installation, the installation may emit or may be influenced by electromagnetic signals. The degree of influence will depend on the nature of the installation within its operating environment and the electrical equipment connected by the wiring. As a minimum precaution to minimise the occurrence of electromagnetic influences, power and data/signal cables should be run on separate cable routings or at least separated by means of dividers.
6. Tighten the fixing assembly by hand.
Our Design Team should be consulted for further information on electromagnetic compatibility issues.
11. Tighten the M6 hex nuts to a torque of 12Nm.
2.8 Assembly Recommendations Instructions for the correct assembly of Vantrunk cable tray straight lengths and fittings are given below.
158
When utilising the standard flat bar coupler as an expansion coupler it will be necessary to order additional M6 nuts (4 per coupler).
2.8.1 Straight Cable Tray to Straight Cable Tray
Details are given in the following table: Material & Finish
Cable tray couplers are supplied with the correct number of fixing sets, each comprising of an M6 x 12 screw and an M6 nut (plus an M6 flat washer for stainless steel fixings). Refer to section 1.6 for details on the recommended number of fixings for cable tray fittings.
7. Repeat for the remaining fixing sets. 8. Repeat the assembly procedure for the second coupler. 9. Fully secure the straight cable tray lengths to the supporting structure. 10. Check the alignment of the coupler and the abutting straight cable trays. Adjust as necessary to give a fair and true alignment.
12. Where required, fit a fish plate coupler to the underside of the joint between the two straight cable trays.
2.8.2 Cable Tray Fitting to Straight Cable Tray
2. Align the slots on the interlocked straight cable tray and cable tray fitting.
Accessories
3. From the inside of the cable tray, insert the threaded portion of an M6 x 12 screw through one of the aligned slots. 4. Fit an M6 flat washer (where provided) and an M6 hex nut onto the protruding thread of the M6 x 12 screw.
Cable Ladder Steel Framing
Couplers
1. Position the straight cable tray and cable tray fitting onto the supporting structure and interlock the cable tray fitting into the straight cable tray.
Cable Tray
Lengths Fittings
tECHNICAL DATA
Covers
6. Repeat for the remaining fixing sets. 7. Fully secure the straight cable tray and cable tray fitting to the supporting structure.
Supports
5. Tighten the fixing assembly by hand.
9. Tighten the M6 hex nuts to a torque of 12Nm.
2.8.3 Cable Tray Fitting to Cable Tray Fitting
Mounting Frame
Technical
8. Check the alignment of the interlocked straight cable tray and cable tray fitting. Adjust as necessary to give a fair and true alignment.
Fixings
1. Position the two cable tray fittings onto the supporting structure, offsetting and interlocking the integral base & side wall coupling tabs. 2. Align the slots on the two cable tray fittings. 3. From the inside of the cable tray, insert the threaded portion of an M6 x 12 screw through one of the aligned slots.
Bespoke
4. Fit an M6 flat washer (where provided) and an M6 hex nut onto the protruding thread of the M6 x 12 screw. 5. Tighten the fixing assembly by hand. 6. Repeat for the remaining fixing sets.
Technical
7. Fully secure the cable tray fittings to the supporting structure. 8. Check the alignment of the abutting components. Adjust as necessary to give a fair and true alignment.
159
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Index
9. Tighten the M6 hex nuts to a torque of 12Nm.
CABLE TRAY SYSTEM
160
2.9 Cable Tray Expansion Joint:
7. Repeat for the remaining fixing sets.
Refer to pg 247 for details on the spacing between expansion couplers and the required gap setting procedure at the time of installation.
9. Check the alignment of the coupler and the abutting straight cable trays. Adjust as necessary to give a fair and true alignment.
1. Position the two straight cable trays onto the supporting structure. 2. Locate the cable tray flat bar coupler on the inside of the two abutting straight cable trays. 3. Position the coupler across the joint between the two straight lengths. Align the slots in the coupler with those in the side wall of the cable tray.
10. Check the setting gap between the straight cable trays and adjust as necessary.
8. Repeat the assembly procedure for the second coupler.
11. Secure the straight cable trays to the supporting structure using nylon spacer pads and hold down brackets to permit movement relative to the structure.
4. From the inside of the cable tray insert the threaded portion of an M6 x 16 screw through one of the aligned slots.
12. Fit the second M6 nut onto the fixing assemblies. Lock the second M6 nut onto the first M6 nut. Check that the completed fixing assembly remains free to move within the aligned slots.
5. Fit an M6 flat washer (where provided) and an M6 hex nut onto the protruding thread of the M6 x 16 screw.
13. Tighten the 2nd M6 hex nut onto the 1sr M6 hex nut to a torque of 12Nm.
6. Tighten the fixing assembly by hand such that the fixing assembly is free to move within the slots (some light resistance to movement is preferable).
14. Ensure that the fixing assembly remains free to move within the slots, otherwise re-assembly as necessary.
3 LOADING INFORMATION
Equivalent weight per metre Wm = 2 x unit weight of equipment (kg) kg/m Span (m)
For example, a secondary item of equipment with a weight of 12kg has an equivalent weight per metre Wm of 16kg/m for a span of 1.5m. This figure should be added to the sum of the individual cable weights (or pipe, etc). When determining the location of secondary items of equipment, care should be taken to either mount these items centrally across the cable tray or place these items adjacent to, or directly onto, the cable tray side walls and as close to the cable tray supports as the installation will allow.
Vantrunk cable tray is not intended to be used as a walkway and on no account should localised point loads be applied onto the bed of the cable tray. On those occasions where it is necessary to apply a point load care should be taken to apply the load evenly onto both side walls of the cable tray, preferably using a board or similar support to distribute the load over as long a section of the cable tray as possible. Where doubt exists, further guidance should be sought from our Design Team.
Cable Ladder Steel Framing Supports Technical
Bespoke
The allowable loading figures given in the tables below include the self weight of the Vantrunk cable tray. The weight data for additional installed components (covers, mounting accessories, etc) for the Vantrunk cable tray system can be provided on request by our Design Team.
Mounting Frame
Weight data for secondary equipment should also be readily available from the equipment manufacturer or supplier and is usually quoted in terms of kilograms (kg). The unit weight for the secondary equipment can be converted into an equivalent weight per metre by using the following formula:
In situations where point loads are applied to heavy duty cable trays, an allowance can be made for the influence of point loads at the design stage when determining the total load to be carried by the Vantrunk cable tray system. When specifying a point load requirement at the design stage it should be noted that the value of the point load should be kept to a minimum as incorporating the point load will reduce the allowable cable load for the Vantrunk cable tray. Loading graphs which include the influence of a mid span point load are available on request.
Covers
Weight data for cables is readily available from the cable manufacturer or supplier and is usually quoted in terms of kilograms per metre (kg/m). The weight per metre from the cables (or pipes, etc) is the sum of the individual cable (or pipe, etc) weights.
Point loads are often applied inadvertently to the cable tray during installation and during in-service inspection. Care should be exercised to avoid these undue point loads, particularly on light duty & medium duty cable trays which are not designed for this type of loading.
Technical
Dead loads include the weight of any cables, pipes and secondary equipment carried on or installed on the cable tray plus the self weight of the cable tray and any component of the cable tray (covers, connectors, accessories, etc.).
Accessories
3.2 Point Loads
Fixings
3.1 Dead Loads
Couplers
To enable the selection of the most appropriate Vantrunk cable tray for a particular installation it is necessary to consider the loads which must be supported and the distance between supports (the span). These loads are broadly classed as dead loads, imposed loads and point loads.
Cable Tray
Lengths Fittings
tECHNICAL DATA
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Index
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CABLE TRAY SYSTEM
3.3 Loading Graphs When correctly mounted and secured, cable tray can be considered to be a ‘continuous beam’. This implies that the cable tray run is regularly supported and that the cable trays at the extremities of the run are firmly anchored. The following tables are used to calculate the safe working load and have been verified by testing in accordance to BS EN 61537. The load bearing capacity of a cable tray is limited by the lesser of the maximum allowable stress induced in the tray section or the maximum deflection acceptable between the supports. The maximum allowable stress is usually limited by the materials lower yield stress; this gives a safety factor of 1.7 against the ultimate tensile strength. Maximum deflection, (in the absence of a particular customer need) is not allowed to exceed 1/360th of the distance between supports (span). Although unusual, there may be occasions when it is difficult or indeed impossible to anchor the cable tray securely in position. Under these circumstances the tray is ‘simply supported’ and its load bearing ability is substantially reduced. As a rough guide maximum loads should be limited to two thirds of those shown in the loading tables and increased deflection values should be accepted for each span. The data given in the graphs is for tray installed as a continuous beam and allows for the weight of the tray itself.
Loading Data for Medium Duty Cable Tray GA UDL (kg/m) 200 180 160 140 120 100 80 60 40 20 0 1
1.25
1.5
1.75
2
Span (m)
50 - 150 200 - 225 300 - 450 600 - 900
Loading Data for Heavy Duty Cable Tray GA UDL 220 (kg/m) 200 180 160 140 120 100 80 60 40 20
Loading information is available for other gauges and for heavy duty cable trays with increased side wall heights – contact our Design Team for details The Vantrunk cable tray system, components and accessories have been tested to BS EN ISO 61537:2002. Further details can be provided by our Design Team.
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0 1
1.75
50 - 150 200 - 225 300 - 450 600 - 900
2
2.25
2.5
Span (m)
Cable Ladder Cable Tray Steel Framing
Couplers Accessories
Technical
Bespoke
Fixings
Mounting Frame
Supports
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Technical
X LBO O O LT ENT A R T I R DIG Y CU NTENT D D KE E CO · AS CLUSIV ARD · EX TICEBO O · N Q's ORE M H UC · FA M , H MUC D N A
Covers
ES
TUR A E F
:
UDE L C IN
Lengths
! EW
G N I C U D L O A M R T I O T IN E DIG X FR OM TH OLBOUNK.C TO NTR VA
Fittings
N
tECHNICAL DATA
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